1 ; RUN: llc -regalloc=greedy < %s | FileCheck %s
3 ; LSR shouldn't introduce more induction variables than needed, increasing
4 ; register pressure and therefore spilling. There is more room for improvement
7 ; CHECK: sub sp, #{{32|24}}
9 ; CHECK: ldr r{{.*}}, [sp, #4]
10 ; CHECK-NEXT: ldr r{{.*}}, [sp, #16]
11 ; CHECK-NEXT: ldr r{{.*}}, [sp, #12]
14 target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
15 target triple = "thumbv7-apple-macosx10.7.0"
17 %struct.partition_entry = type { i32, i32, i64, i64 }
19 define i32 @partition_overlap_check(%struct.partition_entry* nocapture %part, i32 %num_entries) nounwind readonly optsize ssp {
21 %cmp79 = icmp sgt i32 %num_entries, 0
22 br i1 %cmp79, label %outer.loop, label %for.end72
24 outer.loop: ; preds = %for.inc69, %entry
25 %overlap.081 = phi i32 [ %overlap.4, %for.inc69 ], [ 0, %entry ]
26 %0 = phi i32 [ %inc71, %for.inc69 ], [ 0, %entry ]
27 %offset = getelementptr %struct.partition_entry* %part, i32 %0, i32 2
28 %len = getelementptr %struct.partition_entry* %part, i32 %0, i32 3
29 %tmp5 = load i64* %offset, align 4, !tbaa !0
30 %tmp15 = load i64* %len, align 4, !tbaa !0
31 %add = add nsw i64 %tmp15, %tmp5
34 inner.loop: ; preds = %for.inc, %outer.loop
35 %overlap.178 = phi i32 [ %overlap.081, %outer.loop ], [ %overlap.4, %for.inc ]
36 %1 = phi i32 [ 0, %outer.loop ], [ %inc, %for.inc ]
37 %cmp23 = icmp eq i32 %0, %1
38 br i1 %cmp23, label %for.inc, label %if.end
40 if.end: ; preds = %inner.loop
41 %len39 = getelementptr %struct.partition_entry* %part, i32 %1, i32 3
42 %offset28 = getelementptr %struct.partition_entry* %part, i32 %1, i32 2
43 %tmp29 = load i64* %offset28, align 4, !tbaa !0
44 %tmp40 = load i64* %len39, align 4, !tbaa !0
45 %add41 = add nsw i64 %tmp40, %tmp29
46 %cmp44 = icmp sge i64 %tmp29, %tmp5
47 %cmp47 = icmp slt i64 %tmp29, %add
48 %or.cond = and i1 %cmp44, %cmp47
49 %overlap.2 = select i1 %or.cond, i32 1, i32 %overlap.178
50 %cmp52 = icmp sle i64 %add41, %add
51 %cmp56 = icmp sgt i64 %add41, %tmp5
52 %or.cond74 = and i1 %cmp52, %cmp56
53 %overlap.3 = select i1 %or.cond74, i32 1, i32 %overlap.2
54 %cmp61 = icmp sgt i64 %tmp29, %tmp5
55 %cmp65 = icmp slt i64 %add41, %add
56 %or.cond75 = or i1 %cmp61, %cmp65
57 br i1 %or.cond75, label %for.inc, label %if.then66
59 if.then66: ; preds = %if.end
62 for.inc: ; preds = %if.end, %if.then66, %inner.loop
63 %overlap.4 = phi i32 [ %overlap.178, %inner.loop ], [ 1, %if.then66 ], [ %overlap.3, %if.end ]
64 %inc = add nsw i32 %1, 1
65 %exitcond = icmp eq i32 %inc, %num_entries
66 br i1 %exitcond, label %for.inc69, label %inner.loop
68 for.inc69: ; preds = %for.inc
69 %inc71 = add nsw i32 %0, 1
70 %exitcond83 = icmp eq i32 %inc71, %num_entries
71 br i1 %exitcond83, label %for.end72, label %outer.loop
73 for.end72: ; preds = %for.inc69, %entry
74 %overlap.0.lcssa = phi i32 [ 0, %entry ], [ %overlap.4, %for.inc69 ]
75 ret i32 %overlap.0.lcssa
78 !0 = metadata !{metadata !"long long", metadata !1}
79 !1 = metadata !{metadata !"omnipotent char", metadata !2}
80 !2 = metadata !{metadata !"Simple C/C++ TBAA", null}